(a) Define roasting. Name an ore on which roasting is done. Give balanced equation.

(b) Define calcination. Give an example and equation for calcination.

How are the metals like sodium, potassium and calcium obtained. Give equations.

(a) On which factors does purification of metals depend?

(b) Name the methods used for purification.

(c) With a labelled diagram explain electro-refining of a particular metal.

Choose the correct option:

(a) The metal other than aluminum, which has a strong affinity for oxygen is:

(A) Copper

(B) Magnesium

(C) Silver

(D) Gold

(b) A metallic oxide which cannot be reduced by normal reducing agents:

(A) Zinc oxide

(B) Magnesium oxide

(C) Copper (II) oxide

(D) Iron (III) oxide